The Big Sheik wants a big airline...he made his plans...he will achieve.
Lots of changes...yes...but if you look at the background of the people being changed, they GENERALLY have one thing in common. They were placed in positions above what they held with their previous carriers. Some are very good people, some not so good but, many probably out of their depth.
Remember that the expansion is unprecidented, thirty plus destinations in under three years. Experience is required or you get crushed in the expansion stampede.